JPH0438084Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an accumulator device, and in particular, to an accumulator device, and in particular to an accumulator device, the present invention relates to an accumulator device, and in particular, to an accumulator device, which is an accumulator device, and in particular to an accumulator device, which is an accumulator device. This invention relates to improvements in accumulator devices as umulators or gas springs.

[Prior Art] An accumulator device as a main accumulator or gas spring that communicates with the oil chamber of a hydraulic cylinder disposed between the vehicle body side and the axle side of a vehicle is as shown in Fig. 3. Some have been proposed for use in suspension structures.

That is, the oil chambers 1a of the hydraulic cylinders 1, whose upper ends are connected to the vehicle body and whose lower ends are connected to the axle at each of the four wheels of the vehicle, communicate with the main accumulator 3 via the active control valve 2. and the gas spring 5 through the throttle 4 on the other hand.
It is said that the information will be communicated to

A pump 6 serving as a hydraulic pressure supply source is communicated with the main accumulator 3.

A check valve 7 is provided between the pump 6 and the main accumulator 3, a relief valve 8 is provided between the check valve 7 and the pump 6, and the active control valve 2 is connected to the tank. Connected to 9.

Therefore, when the vehicle is running and the hydraulic cylinder 1 is expanded or contracted, if the active control valve 2 is controlled to open as appropriate, pressure oil from the main accumulator 3 is supplied to the hydraulic cylinder 1 or Pressure oil from the hydraulic cylinder 1 is discharged into the tank, and so-called active expansion and contraction control of the hydraulic cylinder 1 becomes possible.

Further, when the active control valve 2 is in a so-called inoperative state, the oil chamber 1a in the hydraulic cylinder 1
is communicated with the gas spring 5, so that vibrations on the spring can be damped as the hydraulic cylinder 1 expands and contracts.

[Problems to be solved by the invention] However, in the suspension structure according to the conventional proposal, the accumulator device as the main accumulator 3 or the gas spring 6,
As shown in FIG. 4, the main body 10 has a bladder 11 made of a rubber membrane or the like inside, and an oil chamber 12 and a gas chamber 1.
However, with long-term use, the gas in the gas chamber 13 leaks into the oil chamber 12 side through the bladder 11 made of a rubber membrane or the like, resulting in a lack of gas pressure. I may be invited.

At this time, due to a lack of gas pressure, that is, a lack of volume in the gas chamber 13, it is no longer possible to accommodate hydraulic oil at a predetermined hydraulic pressure in the oil chamber 12, and the bladder 11 expands and partitions, causing the peripheral edge of the bladder 11 to The bladder 11 may break if it comes into contact with the clamp 14 portion fixed to the inner wall surface of the bladder 10 .

Furthermore, at this time, if the accumulator device is a gas spring 5, a predetermined air spring effect cannot be obtained, resulting in a disadvantage that the riding comfort in the vehicle is deteriorated.

Therefore, in view of the above-mentioned circumstances, the purpose of the present invention is to provide a new accumulator device that can prevent the accumulator device from becoming unusable or becoming unable to perform the desired operation during use. do.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the configuration of the present invention is such that, in an accumulator device having a bladder that partitions an oil chamber and a gas chamber within the main body, A pressure switch is disposed facing the bladder, and the pressure switch is connected to the alarm indicating member via the controller, and when the bladder is expanded beyond a set value, the pressure switch is turned on, and the pressure switch is turned on for a short period of time. Alternatively, the warning indicator member is characterized in that the warning indicator member is activated by a signal from the controller when the number of ON operations exceeds a set activation time or a set activation number.

[Function] When the gas pressure decreases and the bladder is expanded beyond the set value, the pressure switch is activated, and the controller is activated by the signal from the pressure switch, and when the bladder expansion exceeds the set time or the set number of circuits. At this time, the alarm indicator member is activated by a signal from the controller and generates an alarm. This makes it possible to take measures such as replenishing the gas pressure before the bladder is damaged.

[Example] The present invention will be described below based on the illustrated example.

FIG. 1 shows an accumulator device according to the present invention, and this accumulator device is used as the main accumulator 3 or gas spring 5 in the suspension structure shown in FIG. 3 described above. .

This accumulator device includes a main body 10 and a bladder 11 disposed within the main body 10. The bladder 11 allows an oil chamber to be formed within the main body 10.
2 and a gas chamber 13 are partitioned.

The peripheral edge of the bladder 11 is fixed to the inner periphery of the main body 10 in a sealed manner by a clamp 14 connected to the inner periphery of the main body 10.

The above accumulator device has a pressure switch 1
5 is disposed inside the main body 10 facing the bladder 11, but in this embodiment, the pressure switch 1 is
5 is arranged on the gas chamber 13 side. The pressure switch is connected via a controller to an alarm indicator such as an alarm or a lamp.

This pressure switch 15 is configured such that when the bladder 11 is expanded beyond a set value, that is, when the state shown by the broken line in the figure is reached, the pressure switch 15 is switched from the previously off state to the on state, for example. It is formed.

In this embodiment, the pressure switch 1
A guide pin 15a protrudes from the guide pin 15a, and when the contact point 11a of the bladder 11 comes adjacent to the tip of the guide pin 15a, the switching to the on state is performed.

Note that the guide pin 15a may be omitted so that the contact point 11a of the bladder 11 is directly adjacent to the pressure switch 15.

The oil chamber 12 is connected to an external hydraulic cylinder 1 or a pump 6 through a through hole 10a in the main body 10.
(See Figure 3).

Therefore, in the accumulator device formed as described above, for example, when the hydraulic cylinder 1 is expanded or contracted and pressure oil from the hydraulic cylinder 1 flows into the oil chamber 12, the oil chamber 12
The bladder 11 will be expanded until the oil pressure inside and the gas pressure in the gas chamber 13 are balanced, and at this time,
A desired air spring effect can be obtained.

Further, when the expansion of the bladder 11 exceeds the set value, the pressure switch 15 is turned on, and the pressure switch 15 is turned on.
The controller is activated by the signal No. 5, and the bladder 11 is activated by the signal from the controller. This means that the state of expansion exceeding the set value of can be detected from the outside. The controller is pressure switch 1
5 is activated for longer than the set time,
Or, when it is activated more than the set number of ON activations, it sends a signal to the alarm indicating member.

Therefore, when the number of times of detection increases or the detection time becomes longer, the gas chamber 13 is replenished with a predetermined gas pressure. The detection by the pressure switch 15 described above is once input to the controller, and the controller performs arithmetic processing, etc., and then an alarm is issued. The advantage of use is that no nuisance is emitted.

FIG. 2 shows an accumulator device according to another embodiment of the present invention, and in this embodiment, the pressure switch 15 is disposed on the oil chamber 12 side. Unlike the embodiment described above,
Further, the operation of the pressure switch 15 is controlled by the pressure switch 15.
1 is different from the above-described embodiment in that it is configured to be turned on by a tensile force that is generated when stretched beyond a set value.

That is, the pressure switch 15 is connected to the through hole 1 of the main body 10.
The pressure switch 15 is disposed in the pressure switch 15 so as to close the through hole 10a, and one end of the guide wire 15b is connected to the pressure switch 15, and the other end of the guide wire 15b is connected to the bladder 11. It is something to do.

When the bladder 11 expands beyond a set value (the state shown by the broken line in the figure), the guide wire 15b is expanded and the pressure switch 15 is turned on.

Note that the oil chamber 12 is communicated with the hydraulic cylinder 1 or the pump 6 through a port 10b formed in the main body 10.

Therefore, in this embodiment, as in the case of the above-mentioned embodiments, if the bladder 11 is extended for a long time or repeatedly beyond the set value, the abnormal condition is detected from the outside by the operation of the pressure switch 15. You will get it.

Note that this embodiment has the advantage that the intended purpose can be implemented without significantly changing the external appearance of the main body 10.

[Effects of the invention] As described above, according to the invention, when the bladder is expanded beyond a set value and the pressure switch is turned on for more than a set time or a set number of times, an alarm is generated by the alarm indicating member, Since abnormal conditions can be known from the outside, countermeasures such as replenishing the specified gas pressure can be taken before bladder damage occurs.
This has the advantage of improving the durability of the accumulator device.

As a result, a suspension structure in which the accumulator device according to the present invention is used as a main accumulator and a gas spring has the advantage that desired vibration damping and ride comfort can be easily maintained continuously.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an accumulator device according to one embodiment of the present invention, Fig. 2 is a cross-sectional view showing another embodiment, and Fig. 3 is a suspension structure most suitable for use of the accumulator device according to the present invention. FIG. 4 is a sectional view showing an accumulator device as a conventional example. 3... Main accumulator, 5... Gas spring, 10... Body, 11... Bladder, 12... Oil chamber, 13... Gas chamber, 15... Pressure switch.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an accumulator device having a plug in the main body that partitions an oil chamber and a gas chamber, a pressure switch is disposed in the main body facing the bladder, and The pressure switch is connected to the alarm indicating member via the controller, and when the bladder expands beyond the set value, the pressure switch is turned on, and when the on-operation time or number of on-operations of the pressure switch exceeds the set operation time or the set number of operation. 1. An accumulator device characterized in that an alarm indicating member is activated by a signal from a controller when the alarm occurs. (2) The accumulator device according to claim 1, wherein the pressure switch is disposed on the gas chamber side and is activated by a pressing force when the bladder is expanded beyond a set value. (3) The accumulator device according to claim 1, wherein the pressure switch is disposed on the oil chamber side and is configured to be activated by a tensile force when the bladder is extended beyond a set value.